A Must Have for the acoustic/electric/classical guitar playerWorks great on necks up to 51mm wide. It is well constructed of a zinc alloy, lightweight, with an integrated peg puller to remove pegs without damaging your guitar. Works easily and efficiently. Easy to attach and remove with a simple push of one hand. Saves you the hassle of manually adjusting screws like on older screw cap designs. No buzzing. The memory steel spring is powerful, holds the strings and brings the right pressure to the frets without buzzing, changing intonation or bending the strings. It won't fall off and slips easily over the frets/bars. No damage to your Guitar - Thick silicone pads protect your guitar from scratches and damage